rviz - only base_link works

Hello Everyone! At first, sorry for my English :( I`ve got a problem. I'm beginner at ROS (melody, ubuntu 18.04). I learing how to do a URDF file, i'm using this tutorial: https://www.youtube.com/watch?v=Ale55LcdZeE&list=PLK0b4e05LnzaY2QxaTHkvLJPNVNx-ssDW&index=24 . When i start rviz a only see a `base_link` (without `link_01`), I try to change URDF file but it doesn`t helped. this is my xacro file: and launch file: i would be very grateful for Your help! Pawel :)